R0106-HP MSR Router Series Voice Configuration Guide(V7)

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Figure 16 Call establishment
• Call release at the originating side.
The originating side sends a clear-forward signal 10. When the terminating side recognizes the
clear-forward signal, it sends a backward signal 10. When the originating side recognizes the
backward signal 10, it releases the call.
Figure 17 Call release at originating side
• Call release at the terminating side.
The terminating side sends a clear-back signal 11 to the originating side, and the originating side
sends back a clear-forward signal 10. When the terminating side recognizes the forward signal
10, it sends a release-guard signal 10. When the originating side recognizes the release-guard
signal 10, it releases the call.
Figure 18 Call release at terminating side
• Blocking in idle state or during conversation.
After the originating side receives a blocking signal 11 from the terminating side when the circuit
is idle or during conversation, the circuit is blocked. In this case, the originating side still sends the
forward signal 10 to indicate that the line is idle. When the terminating side unblocks the circuit,